The common method for extracting oxygen from iron oxides for isotopic analysis uses bromine pentafluoride as reductant [1]. This method is also suitable for silicates and other oxides, which are often associated with iron oxides in sedimentary and weathering environments. Contamination of oxygen isotope ratios of iron oxides by other minerals, such as kaolinite, gibbsite and carbonates in the case of natural mixtures, is quite probable and is an important disadvantage of the bromine pentafluoride method.
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